摘要
就学生在无机化学实验教学过程中提出的问题作一解答。认为:(1)Cr3+与NH3.H2O作用主要是生成Cr(OH)3,而不是[Cr(NH3)6]3+离子;(2)在有NH4+时,Zn(OH)2易溶于NH3.H2O;(3)[Co(NO2)6]3-溶液中加入强酸,其分解产物是Co2+,不是Co3+;(4)[Fe(SCN)6]3-遇H2O2,血红色消失的原因是过量的H2O2氧化了SCN-。
The paper attempts to solve the problem posed by students in the process inorganic chemistry experimenting teaching. This paper points out Cr^3+ and NH3·H2O functions mainly give birth to chrome hydroxide, not the chrome ( III ) ammonia matches with the thing; when the NH4^+ exists, the zinc hydroxide is easily dissolved in the ammonia water; if it is put in the aqua of [ Co ( NO2) 6 ]^3 - strong acid, its resolution outcome is cobalt ( II ), not cobalt ( III ) ; the Fe (SCN) N^3- meet H2O2, the reason why blood-red color disappears is the H2O2 of surfeit to oxidize the SCN^-.
出处
《四川文理学院学报》
2007年第5期37-39,共3页
Sichuan University of Arts and Science Journal